21613202 has 16 divisors (see below), whose sum is σ = 35051352. Its totient is φ = 9936000.

The previous prime is 21613199. The next prime is 21613213. The reversal of 21613202 is 20231612.

It is a Cunningham number, because it is equal to 4649²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 11621281 + 9991921 = 3409^2 + 3161^2 .

It is a plaindrome in base 11.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5702 + ... + 8702.

Almost surely, 2^21613202 is an apocalyptic number.

21613202 is a deficient number, since it is larger than the sum of its proper divisors (13438150).

21613202 is a wasteful number, since it uses less digits than its factorization.

21613202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3293.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21613202 is about 4649.0001075500. Note that the first 3 decimals coincide. The cubic root of 21613202 is about 278.5520575867.

Adding to 21613202 its reverse (20231612), we get a palindrome (41844814).

The spelling of 21613202 in words is "twenty-one million, six hundred thirteen thousand, two hundred two".